Effect of Architecture on the Properties of Polyisobutylene-Based TPE Materials
Why this work is in the frame
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Bibliographic record
Abstract
Abstract This paper will discuss the design and synthesis of polyisobutylene-based thermoplastic elastomers (TPEs) for biomedical and other specialty applications. The first generation from this class of polymers, linear triblock polystyrene- b -polyisobutylene- b -polystyrene (PSt- b -PIB- b -PSt or SIBS), is FDA-approved and currently used as the polymeric coating on drug-eluting coronary stents. TPEs with arborescent (dendritic) polyisobutylene core ( arb PIB- b -PSt) the third generation, display unique combination of properties. Our latest results include the synthesis of surface-modified TPEs. This paper will give a short overview of the effect of architecture (number of branches, molecular weight and size) on select properties of arb PIB-based TPEs. It will be demonstrated that block copolymers with a high molecular weight dendritic (arborescent) polyisobutylene core and poly( para -methylstyrene) end blocks can manifest themselves either as a rubber, or as a plastic, depending on their environment. The behavior is thermally irreversible. We called this material the “chameleon thermoplastic elastomer.” This material represents a new concept in material science: ETPE (entropy-driven thermoplastic elastomer).
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Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.001 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from it